setText（）不起作用

Question

I have a one EditText in my xml.It throws no exception but the text "kailash" I had set in EditText is not displayed. It shows me empty EditText . In debugging I show that compiler executing the tx1.setText("kailash"); But dont know this doesnt work.I have a simple MainActivity in that there is a search button and onclick of search button I am trying to display a dialog .Please help me. This is my code:--

Dialog dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.search_dialog);
RelativeLayout layout = (RelativeLayout) MainActivity.this.getLayoutInflater()
                                      .inflate(R.layout.search_dialog, null);
EditText txt1 = (EditText) layout.findViewById(R.id.txt1);
txt1.setText("kailash");
dialog.show();

this is my xml code:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"  >

 <EditText
        android:id="@+id/txt1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@android:drawable/editbox_background"
    android:textSize="16dp" />
</RelativeLayout>

Answer 1

final EditText txt1 = (EditText) findViewById(R.id.txt1);
txt1.setText("kailash");

call findViewById on your Activity Class, not a RelativeLayout you just inflate (for no reason IMHO)

Answer 2

you can't change final - it's a constant. Define it without the final modifier, set your text, then define other instance as final

Answer 3

Back to the original post.

Kailash, it looks like the code first sets the dialog's content view from the XML layout: dialog.setContentView(R.layout.search_dialog);

... and then creates ANOTHER instance of the same resource by inflating it into another object, layout.

Then you modify the text view in the latter, but Android shows the former view.

How about this?

EditText txt1 = (EditText) dialog .findViewById(R.id.txt1);

Answer 4

Well, though successful, this line swap looks like magic. May be just an implementation specific coincidence - regression prone. It may depend on the inflater internals, where the layout objects are cached, etc. You still inflate into an object instance potentially different from the content view. If it happens to be the same in the current implementation, is there any guarantee it will always be the same?

OTOH, dialog .findViewById seems to be more robust: you just get a reference to a component in the dialog - exactly like you would do with an Activity.

Am I missing anything?

Answer 5

set text like this

View vv;        
    LayoutInflater  inflater  =  (LayoutInflater) YourClassName.this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);     
    vv = inflater.inflate(R.layout.rowrelative, null);      
    EditText  edt =(EditText) vv.findViewById(R.id.editText1);
    edt.setText("Ankit");       
    this.addContentView(vv, new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.MATCH_PARENT));

Here you need to change Your Class name and Rowxml File Name

Answer 6

actually the solution is very simple i was putting this code :

dialog.setContentView(R.layout.search_dialog);
RelativeLayout layout = (RelativeLayout) MainActivity.this.getLayoutInflater()
                                  .inflate(R.layout.search_dialog, null);

instead of this code:

 RelativeLayout layout = (RelativeLayout) MainActivity.this.getLayoutInflater()
                                  .inflate(R.layout.search_dialog, null);
 dialog.setContentView(R.layout.search_dialog);

as activity has another layout in its setcontentView() method so it does not recognize the another layout so u should first load the layout by inflater and put it in dialog's setContentView method to make it work. hope it helps somebody . and thanks for ur support.